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Old 09-04-2017, 04:21 AM   #4 (permalink)
herp derp Apprentice
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Aerodynamic Investigation of Vehicle Cooling-Drag ...It is estimated that about 10% of the overall aerodynamic drag originates from the cooling... ...cooling and ventilation system ~ 10%...

3% or 1/3 of the 10% seems reasonable for a DIY modification to a still functioning cooling system
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